We ain't none of us perfect, so if you've ever accidentally added a misspelled word to your Firefox dictionary, here's how to remove the misspelling to avoid looking like a fool in front of your friends, family, and coworkers:

1. Open your application data folder. On XP or Vista, go to your Start menu and hit Run (or just press Windows-R) and paste in %APPDATA%\Mozilla\Firefox\Profiles; on your Mac, navigate to ~/Library/Application Support/Firefox/Profiles.
2. Find your profile folder, which by default should look something like xxxxxxxx.default.
3. Inside your profile folder, find the file called persdict.dat and open it up in your text editor of choice.
4 Now just find the misspelling, delete it, and you're done.

Simple, huh? If you want to make your list of manual dictionary additions available on other Firefox installations, we've covered that, too. — Adam Pash